The Sun and other stars are magnetic: magnetism pervades their interiors and affects their
evolution in a variety of ways. In the Sun, both the fields themselves and their influence on …

Stars lose a significant amount of angular momentum between birth and death, implying that
efficient processes transporting it from the core to the surface are active. Space …

A knowledge of stellar ages is crucial for our understanding of many astrophysical
phenomena, and yet ages can be difficult to determine. As they become older, stars lose …

The determination of exoplanet properties and occurrence rates using Kepler data critically
depends on our knowledge of the fundamental properties (such as temperature, radius, and …

We report on precise Doppler measurements of L231-32 (TOI-270), a nearby M dwarf (d= 22
pc, M⋆= 0.39 M⊙, R⋆= 0.38 R⊙), which hosts three transiting planets that were recently …

Variability in the light curves of spotted, rotating stars is often non-sinusoidal and quasi-
periodic–spots move on the stellar surface and have finite lifetimes, causing stellar flux …

Ultrashort-period (USP) exoplanets have orbital periods shorter than 1 day. Precise masses
and radii of USP exoplanets could provide constraints on their unknown formation and …

We show that the masses of red giant stars can be well predicted from their photospheric
carbon and nitrogen abundances, in conjunction with their spectroscopic stellar labels log g …

We present a new age-dating technique that combines gyrochronology with isochrone fitting
to infer ages for FGKM main-sequence and subgiant field stars. Gyrochronology and …

We review the application of the one-dimensional Mixing Length Theory (MLT) model of
convection in stellar interiors and low-mass stellar evolution. We summarize the history of …